矿渣基轻质多孔地质聚合物的制备与孔结构研究

摘要/Abstract

摘要： 以矿渣微粉为主要原料,硅酸钠和氢氧化钠混合溶液为碱性激发剂,铝粉为发泡剂,制备地质聚合物基轻质多孔材料,系统研究了发泡剂、水灰比以及萘系减水剂对材料孔结构与物理性能的影响。结果表明,Al粉在碱性激发剂作用下快速反应生成H₂,促使地质聚合物浆体泡沫化形成多孔材料,且材料的干密度和抗压强度随Al粉掺量的增加迅速降低。当Al粉掺量超过0.40%(质量分数,下同),泡孔急剧增大,导致泡孔聚并,强度显著降低。提升水灰比可降低泡孔生长阻力,促使密度快速减小。但水灰比＞0.40后,浆体黏度和激发剂浓度显著降低,凝结时间延长,孔径增大,结构劣化,其最优水灰比为0.35。此外,萘系减水剂可有效调节多孔地质聚合物的孔结构,仅添加0.4%的萘系减水剂即可促使孔径分布均一,孔壁完整性提升,试样抗压强度提升。

关键词: 地质聚合物, 多孔材料, 矿渣微粉, 孔结构, 力学性能, 萘系减水剂

Abstract: The geopolymer-based lightweight porous material was prepared using slag micronized powder as main raw material, mix solution of sodium silicate and sodium hydroxide as alkaline activator, and aluminum powder as foaming agent. The effects of foaming agent, water-cement ratio and naphthalene water reducer on the pore structure and physical properties of material were systematically investigated. The results show that Al powder reacts rapidly with alkaline activator to generate H₂, which promotes the foaming of geopolymer slurry to form porous material, and the dry density and compressive strength of material decrease rapidly with the increase of the Al powder content. However, if Al powder content exceeds 0.40% (mass fraction, the same below), the cell increases sharply, resulting in cell aggregation and a significant reduction in strength. Raising the water-cement ratio can reduce cell growth resistance and promote a rapid reduction in density. Nonetheless, when the water-cement ratio＞0.40, the slurry viscosity and activator concentration significantly decrease, setting time prolongs, pore size increases and structure deteriorates. Thus, the optimal water-cement ratio is 0.35. In addition, naphthalene water reducer is effective in regulating the pore structure of porous geopolymer. Adding only 0.4% of naphthalene water reducer could promote uniform pore size distribution, enhance pore wall integrity, and improve the compressive strength of specimens.

Key words: geopolymer, porous material, slag micronized powder, pore structure, mechanical property, naphthalene water reducer

中图分类号:

TQ177

朱泽天, 葛雪祥, 樊传刚, 张卫鹏, 牛茂祥, 李圣军, 华磊. 矿渣基轻质多孔地质聚合物的制备与孔结构研究[J]. 硅酸盐通报, 2022, 41(10): 3567-3577.

ZHU Zetian, GE Xuexiang, FAN Chuangang, ZHANG Weipeng, NIU Maoxiang, LI Shengjun, HUA Lei. Preparation and Pore Structure of Slag Based Light Porous Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3567-3577.

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